When teflon heats up it gives off a toxic gas that WILL kill your bird and can kill other pets and also humans.
Birds take in oxygen in a more efficient manner due to the way their resp system is set up so it only takes a fraction of a gas to kill a bird than it takes to kill a mammal.
"Teflon toxicosis or “polymer fume fever” in birds. As noted in the National Academies of Sciences report (National Research Council 1991), polymer fume fever in birds has been known since the 1970s. Upon heating, olytetrafluoroethylene or PTFE, a common coating on non-stick cookware, undergoes pyrolysis (heat-induced breakdown) and forms solid particle fumes (Seidel 1991). These fumes coat the inside surface of lungs, causing shortness of breath, shivering, dizziness, and death by asphyxiation in pet birds (Blandford 1975; Wells 1983), as well as severe flu-like symptoms in bird owners (National Research Council 1991; Shusterman 1993)."
here is a couple of links.
http://www.avianweb.com/teflon.htm
http://www.organicconsumers.org/foodsafety/dupont121605.cfm
They still dont know the full effects of long term use but im not going to take a chance, (there is a reason why miners carried birds into the mine with them, they didnt want to die)
John